Harnessing Multi‐Effect Coupling for Deep‐Level Trap Engineering in Graphene/Liquid Crystal Polymer Composites Toward High‐Fidelity Electrostatic Loudspeakers

ABSTRACT Electrostatic loudspeakers (ESLs) demand lightweight, robust diaphragms with stable high‐density charge storage, yet conventional electrets suffer from rapid charge dissipation, shallow trap levels, and severe environmental sensitivity. This work reports a microstructural regulation strategy based on the strong interaction between liquid crystal polymer (LCP) and multilayer graphene (MLG), combined with fluorinated liquid crystals (F‐LC). The strong π–π stacking interaction between the rigid mesogenic units of LCP and MLG modulates the band structure of MLG and induces Maxwell–Wagner–Sillars (MWS) interfacial polarization. It constructs deep‐level charge traps and increases the density of charge traps. The strong electrostatic attraction of F‐LC enhances charge‐trapping capability and improves the hydrophobicity of the composite, delivering superior environmental stability. Thermally stimulated discharge current (TSDC) measurements confirm a trap energy level of 1.8 eV, with an average absolute surface potential of 8.7 kV. The resulting electrostatic loudspeaker achieves a maximum sound pressure level (SPL) of 91.4 dB at 775 Hz and extremely low total harmonic distortion (THD < 0.53%) over a wide frequency range (3–20 kHz). This work provides a promising pathway for high‐fidelity, bias‐free flexible acoustic transducers, overcoming the long‐standing bottleneck for ESLs in consumer and automotive applications.